S
M
T
W
T
F
S
30
72°
58°
31
75°
51°
1
78°
59°
2
76°
64°
3
82°
63°
4
78°
64°
5
72°
57°
6
73°
56°
7
79°
50°
8
68°
53°
9
71°
62°
10
73°
49°
11
64°
42°
12
74°
57°
13
78°
56°
14
71°
54°
15
72°
57°
16
71°
50°
17
69°
51°
18
63°
47°
19
61°
46°
20
64°
47°
21
62°
46°
22
62°
50°
23
67°
51°
24
70°
50°
25
70°
51°
26
69°
48°
27
63°
46°
28
67°
49°
29
69°
50°
30
70°
51°
1
70°
51°
2
69°
50°
3
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lyon Mountain
Lyon Mountain's September 2026 forecast shows daily high temperatures ranging from 61° to 78°, with overnight lows between 42° and 62°. The average high for September is 68° with an average low of 50°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Lyon Mountain. See also: October | November | December.
